It could be a fungal disease known as jock itch, especially, if it spreads fast to near by ares. Keeping the area dry and using anti fungals would help in this case, but consult a doctor and get it diagnosed properly.
prescribed clotrimazole and betamethasone dipropionate but after couple days symptoms reapear did some std test all was negative planning on going back to the doc soon just want some ideas
You should apply these creams for the duration specified by the doctor, not more or less. Normally fungal infection will take a week to go off fully.
You can get reinfected form your partner if you are sexually active and in that case both of you should get checked and treated simultaneously, or abstain from sex till you are cured fully if your partner is not infected. You can also get reinfection, if you are living in a mold infested house. You have to keep your private parts dry and ensure that the clothes you wear are also clean and dry. Living in a moist environment can also lead to recurring fungal infection.
In any case do consult the doctor till it gets cured fully.